Crooked Treehouse
A hollowed out tree trunk (sourced from managed forests around the UK) allows kids to step through the door and climb a ladder to the clubhouse above. Smaller kids and less agile adults can use the stairs up to the balcony. How cool is that! It even boasts a side swing, rear monkey bars, porch, micro-porous weatherproof roof and log window.
Of course quality like this does not come cheap. But the Crooked Treehouse will last a lifetime – probably longer. Besides, the way the property market’s going you could always use it as a second home when the bailiffs come a-knocking after you’ve blown all your cash on, er, a high quality handmade treehouse for the kids.